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Assets/Packages/com.unity.uiextensions/Runtime/Scripts/Effects/ShaderEffects/UIAdditiveEffect.cs

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+/// Credit 00christian00
+/// Sourced from - http://forum.unity3d.com/threads/any-way-to-show-part-of-an-image-without-using-mask.360085/#post-2332030
+
+
+namespace UnityEngine.UI.Extensions
+{
+    [AddComponentMenu("UI/Effects/Extensions/UIAdditiveEffect")]
+    [ExecuteInEditMode]
+    [RequireComponent(typeof(RectTransform))]
+    public class UIAdditiveEffect : MonoBehaviour
+    {
+        MaskableGraphic mGraphic;
+
+        // Use this for initialization
+        void Start()
+        {
+            SetMaterial();
+        }
+
+        public void SetMaterial()
+        {
+            mGraphic = this.GetComponent<MaskableGraphic>();
+            if (mGraphic != null)
+            {
+                if (mGraphic.material == null || mGraphic.material.name == "Default UI Material")
+                {
+                    //Applying default material with UI Image Crop shader
+                    mGraphic.material = new Material(ShaderLibrary.GetShaderInstance("UI Extensions/UIAdditive"));
+                }
+            }
+            else
+            {
+                Debug.LogError("Please attach component to a Graphical UI component");
+            }
+        }
+        public void OnValidate()
+        {
+            SetMaterial();
+        }
+    }
+}